Malicious PDF — malware analysis report

Static analysis result for SHA-256 058c01690498a5d5…

MALICIOUS

PDF

76.5 KB Created: 2021-01-06 02:10:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6421020d8df6a673b0740fe870673773 SHA-1: bef26ad5989e318be6c34c68ecb9da39240b1489 SHA-256: 058c01690498a5d5b46b8aed1eff4a5b0703c652288f10f5b0621db2feac15c6
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate this PDF is part of a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/123?utm_term=apk+mortal+kombat+2 In PDF document text
    • https://cdn.sqhk.co/japivuwali/giihiaF/best_flight_simulator_for_pc_mac.pdfIn PDF document text
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/98aa36f.pdfIn PDF document text
    • https://nefirekemoziwep.weebly.com/uploads/1/3/4/3/134332842/fujowagebud-mazobirufel-jezatigefijevaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/43735518-5ce6-4bde-9b5b-c2a1e2479243/58351315807.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/59601280501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35dd5cfe-587c-4e1f-a65a-b74e191cdb72/45274836606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87af201c-dd6b-49c1-905c-b15d3ba2f2e9/sudonipasola.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/4554491784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece9ed2e-002c-4de7-a7b2-088a1dae38ce/bujevafumupo.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/chopin_prelude_in_e_minor_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/grim_dawn_leveling_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/chocolate_movie_song_ming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f668568-20cd-4988-998c-39429d7b24eb/tipowosir.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/chapter_3_study_guide_of_mice_and_men.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 5112 bytes
SHA-256: 2e115bbb6bb0e8325b26c891675b1d4ea9ac05b16140594bbc87248e8c8f710b
font_01_sfnt_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 11044 bytes
SHA-256: d687ee789b99a3bcf1a86622dd431e6c20a2b5e33d6fa33d0312c097ec6c9aac

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